/Engine/Source/Runtime/Core/Public/Tasks/Task.h
Waits for task's completion with timeout. Tries to retract the task and execute it in-place, if failed - blocks until the task is completed by another thread. If timeout is zero, tries to retract the task and returns immedially after that.
true if the task is completed
bool Wait ( [FTimespan](API\Runtime\Core\Misc\FTimespan) Timeout ) const